"Well then, can I get bread, please?"
That's definitely not a bug. In modern Japanese it must be written with a small ゃ rather than a full size や, else it is wrong.
じ ji + small ゃ ya = ja sound
じゃあ = jaa
じやあ = jiyaa
Are you typing it with a keyboard or on your phone touchscreen? If you're typing it on your keyboard with "romaji input" (you type romaji and it turns into hiragana), then simply type the word the way I've spelt the sounds.
If you type ja it will output「じゃ」.
** Edit **
Also, if want to type the small symbol on its own, type it with an x in front.
ya = や (full size)
xya = ゃ (small)
Also, if the user uses a tenkey-like input on phone touchscreen, there is usually a small button probably combines dakuten (゛), han-dakuten (゜), chooon-bar (ー), and / or the 'shrink' operator (小). Find the kanji 小. Type a normal-size や and press the 小 button, and get a small ゃ.
This is with doing the course on web rather than the app. The course isn't officially released on web yet, however it's still pretty good in its current state. It wasn't even all that bad over two months ago, back when people discovered the trick to access it on web! I have a 63 day streak with just doing the Japanese course on web — I haven't used any of the apps or started doing any other trees on this account. ^^
The web version is just not very suitable for beginners, as they haven't yet added whatever it is that's causing the delay of it being officially released.